2157380 has 24 divisors (see below), whose sum is σ = 4558680. Its totient is φ = 857600.

The previous prime is 2157361. The next prime is 2157391. The reversal of 2157380 is 837512.

It can be written as a sum of positive squares in 4 ways, for example, as 329476 + 1827904 = 574^2 + 1352^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5180 + ... + 5580.

It is an arithmetic number, because the mean of its divisors is an integer number (189945).

2^2157380 is an apocalyptic number.

2157380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157380 is an abundant number, since it is smaller than the sum of its proper divisors (2401300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2157380 is a wasteful number, since it uses less digits than its factorization.

2157380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 2157380 is about 1468.8022331138. The cubic root of 2157380 is about 129.2137952661.

The spelling of 2157380 in words is "two million, one hundred fifty-seven thousand, three hundred eighty".